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Lecture 6

PSYC1003 Lecture Notes - Lecture 6: Parallax, Superior Colliculus, Retina

2 pages68 viewsFall 2016

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Dr.Harald Taukulis

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Secondary pathway: superior colliculus→ thalamus→ primary visual cortex
Feature detectors: microelectrode recording of axons in animals lead to the discovery of feature
detectors- neurons that respond selectively to lines, edges, etc.Ventral visual stream: the “what”
pathway- colour, shape, etc.
Dorsal visual system: the “where” pathway- depth, motion, etc.
Visual agnosia: inability to recognize objects
Prosopagnosia: inability to recognize faces
Subtractive colour mixing: removing certain colour from the mixture; perceiving less light
Additive colour mixing: putting more colours in the mixture; perceiving more light
Colour vision theories:
Trichromatic colour theory: receptors for red, green, and blue are in cones; colour mixing
is done in our own eyes
Opponent process theory: three pairs of antagonist colours: red/green, blue/yellow,
Current perspective: both theories necessary
Reversible figure: a drawing compatible with two interpretations
Perceptual set: readiness to perceive a stimulus in a certain way
Inattentional blindness: failure to see fully visible objects
Top-down processing- formulate perceptual hypothesis about the nature of the stimulus as a
whole, select and examine features to check hypothesis, recognize stimulus
Bottom up processing: Detect specific features of stimulus, combine specific features into more
complex forms, recognize stimulus
Gestalt principles:
“The whole is greater than the sum of its parts”
Phi phenomenon: the illusion of movement created by presenting visual stimuli in rapid
succession (flip book)
Figure and ground: figure is the thing being looked at; ground is its background
Proximity: thinking things closer together belong together
Similarity: tendency to group together stimuli that are similar
Continuity: tendency to connect points in search of a nice flow
Closure: grouping elements to “complete” the picture
Simplicity: tendency to organize forms in the simplest way possible
Distal stimuli: the actual stimuli, not touching the eye
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